<template>
  <el-container>
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="../assets/logo.png"
             alt />
        <span>用户管理系统</span>
      </div>
      <div class="pull-right">
        <el-avatar :src="require('../assets/avatar.png')"></el-avatar>
        <el-dropdown @command="logout()">
          <span class="el-dropdown-link">
            <i class="el-icon-arrow-down el-icon--right"></i>
          </span>
          <el-dropdown-menu slot="dropdown">
            <el-dropdown-item command="a">退出</el-dropdown-item>
          </el-dropdown-menu>
        </el-dropdown>
      </div>
      <!-- <el-button type="info" @click="logout">退出</el-button> -->
    </el-header>
    <!-- 主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <el-menu unique-opened
                 :collapse="isCollapse"
                 :collapse-transition="false"
                 router
                 :default-active="activePath"
                 background-color="#333744"
                 text-color="#fff"
                 active-text-color="#409FFF">
          <!-- :unique-opened="true"->只允许展开一个菜单 -->
          <!-- :collapse-transition="false" -> 关闭动画 -->
          <!-- router -> 导航开启路由模式 -->
          <!-- 一级菜单  -->
          <!-- 一级菜单的模板区域 -->
          <el-menu-item index="users"
                        key="1">
            <template slot="title">
              <i class="iconfont icon-user"></i>
              <span>用户管理</span>
            </template>
          </el-menu-item>
        </el-menu>
      </el-aside>
      <!-- 内容主体 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      // 默认不折叠
      isCollapse: false,
      // 被激活导航地址
      activePath: "",
    };
  },
  created() {
    this.activePath = window.sessionStorage.getItem("activePath");
  },
  methods: {
    logout() {
      // 清空token
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    // 菜单的折叠与展开
    togleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存连接的激活地址
    saveNavState(activePath) {
      window.sessionStorage.setItem("activePath", activePath);
    },
  },
};
</script>

<style lang="less" scoped>
.el-container {
  height: 100%;
}
.el-header {
  background-color: #373f41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    img {
      height: 40px;
    }
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;

  .el-menu {
    border: none;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  // 鼠标放上去变成小手
  cursor: pointer;
}
</style>
